diff --git a/xilinx/common/tcl/prologue.tcl b/xilinx/common/tcl/prologue.tcl
index 3476b04..dbee383 100644
--- a/xilinx/common/tcl/prologue.tcl
+++ b/xilinx/common/tcl/prologue.tcl
@@ -115,4 +115,5 @@ if {[get_filesets -quiet constrs_1] eq ""} {
 }
 
 set obj [current_fileset -constrset]
-add_files -norecurse -fileset $obj [glob -directory $constraintsdir {*.xdc}]
+add_files -norecurse -fileset $obj [glob -directory $constraintsdir -nocomplain {*.xdc}]
+add_files -norecurse -fileset $obj [glob -directory $constraintsdir -nocomplain {*.tcl}]